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kernel/torture.c
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * Common functions for in-kernel torture tests. * |
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* Copyright (C) IBM Corporation, 2014 * |
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* Author: Paul E. McKenney <paulmck@linux.ibm.com> |
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* Based on kernel/rcu/torture.c. */ |
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#define pr_fmt(fmt) fmt |
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#include <linux/types.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> #include <linux/kthread.h> #include <linux/err.h> #include <linux/spinlock.h> #include <linux/smp.h> #include <linux/interrupt.h> #include <linux/sched.h> |
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#include <linux/sched/clock.h> |
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#include <linux/atomic.h> #include <linux/bitops.h> #include <linux/completion.h> #include <linux/moduleparam.h> #include <linux/percpu.h> #include <linux/notifier.h> #include <linux/reboot.h> #include <linux/freezer.h> #include <linux/cpu.h> #include <linux/delay.h> #include <linux/stat.h> #include <linux/slab.h> #include <linux/trace_clock.h> |
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#include <linux/ktime.h> |
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#include <asm/byteorder.h> #include <linux/torture.h> |
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#include "rcu/rcu.h" |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com>"); |
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static bool disable_onoff_at_boot; module_param(disable_onoff_at_boot, bool, 0444); |
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static bool ftrace_dump_at_shutdown; module_param(ftrace_dump_at_shutdown, bool, 0444); |
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static char *torture_type; |
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static int verbose; |
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/* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */ #define FULLSTOP_DONTSTOP 0 /* Normal operation. */ #define FULLSTOP_SHUTDOWN 1 /* System shutdown with torture running. */ #define FULLSTOP_RMMOD 2 /* Normal rmmod of torture. */ static int fullstop = FULLSTOP_RMMOD; |
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static DEFINE_MUTEX(fullstop_mutex); |
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#ifdef CONFIG_HOTPLUG_CPU /* * Variables for online-offline handling. Only present if CPU hotplug * is enabled, otherwise does nothing. */ static struct task_struct *onoff_task; static long onoff_holdoff; static long onoff_interval; |
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static torture_ofl_func *onoff_f; |
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static long n_offline_attempts; static long n_offline_successes; static unsigned long sum_offline; static int min_offline = -1; static int max_offline; static long n_online_attempts; static long n_online_successes; static unsigned long sum_online; static int min_online = -1; static int max_online; /* |
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* Attempt to take a CPU offline. Return false if the CPU is already * offline or if it is not subject to CPU-hotplug operations. The * caller can detect other failures by looking at the statistics. */ bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes, unsigned long *sum_offl, int *min_offl, int *max_offl) { unsigned long delta; int ret; |
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char *s; |
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unsigned long starttime; if (!cpu_online(cpu) || !cpu_is_hotpluggable(cpu)) return false; |
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if (num_online_cpus() <= 1) return false; /* Can't offline the last CPU. */ |
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if (verbose > 1) |
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pr_alert("%s" TORTURE_FLAG "torture_onoff task: offlining %d ", torture_type, cpu); starttime = jiffies; (*n_offl_attempts)++; |
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ret = remove_cpu(cpu); |
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if (ret) { |
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s = ""; if (!rcu_inkernel_boot_has_ended() && ret == -EBUSY) { // PCI probe frequently disables hotplug during boot. (*n_offl_attempts)--; s = " (-EBUSY forgiven during boot)"; } |
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if (verbose) pr_alert("%s" TORTURE_FLAG |
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"torture_onoff task: offline %d failed%s: errno %d ", torture_type, cpu, s, ret); |
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} else { |
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if (verbose > 1) |
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pr_alert("%s" TORTURE_FLAG "torture_onoff task: offlined %d ", torture_type, cpu); |
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if (onoff_f) onoff_f(); |
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(*n_offl_successes)++; delta = jiffies - starttime; |
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*sum_offl += delta; |
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if (*min_offl < 0) { *min_offl = delta; *max_offl = delta; } if (*min_offl > delta) *min_offl = delta; if (*max_offl < delta) *max_offl = delta; } return true; } EXPORT_SYMBOL_GPL(torture_offline); /* * Attempt to bring a CPU online. Return false if the CPU is already * online or if it is not subject to CPU-hotplug operations. The * caller can detect other failures by looking at the statistics. */ bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes, unsigned long *sum_onl, int *min_onl, int *max_onl) { unsigned long delta; int ret; |
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char *s; |
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unsigned long starttime; if (cpu_online(cpu) || !cpu_is_hotpluggable(cpu)) return false; |
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if (verbose > 1) |
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pr_alert("%s" TORTURE_FLAG "torture_onoff task: onlining %d ", torture_type, cpu); starttime = jiffies; (*n_onl_attempts)++; |
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ret = add_cpu(cpu); |
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if (ret) { |
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s = ""; if (!rcu_inkernel_boot_has_ended() && ret == -EBUSY) { // PCI probe frequently disables hotplug during boot. (*n_onl_attempts)--; s = " (-EBUSY forgiven during boot)"; } |
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if (verbose) pr_alert("%s" TORTURE_FLAG |
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"torture_onoff task: online %d failed%s: errno %d ", torture_type, cpu, s, ret); |
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} else { |
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if (verbose > 1) |
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pr_alert("%s" TORTURE_FLAG "torture_onoff task: onlined %d ", torture_type, cpu); (*n_onl_successes)++; delta = jiffies - starttime; *sum_onl += delta; if (*min_onl < 0) { *min_onl = delta; *max_onl = delta; } if (*min_onl > delta) *min_onl = delta; if (*max_onl < delta) *max_onl = delta; } return true; } EXPORT_SYMBOL_GPL(torture_online); /* |
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* Execute random CPU-hotplug operations at the interval specified * by the onoff_interval. */ static int torture_onoff(void *arg) { int cpu; |
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int maxcpu = -1; DEFINE_TORTURE_RANDOM(rand); |
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int ret; |
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VERBOSE_TOROUT_STRING("torture_onoff task started"); for_each_online_cpu(cpu) maxcpu = cpu; WARN_ON(maxcpu < 0); |
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if (!IS_MODULE(CONFIG_TORTURE_TEST)) { |
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for_each_possible_cpu(cpu) { if (cpu_online(cpu)) continue; |
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ret = add_cpu(cpu); |
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if (ret && verbose) { pr_alert("%s" TORTURE_FLAG "%s: Initial online %d: errno %d ", __func__, torture_type, cpu, ret); } } |
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} |
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if (maxcpu == 0) { VERBOSE_TOROUT_STRING("Only one CPU, so CPU-hotplug testing is disabled"); goto stop; } |
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if (onoff_holdoff > 0) { VERBOSE_TOROUT_STRING("torture_onoff begin holdoff"); schedule_timeout_interruptible(onoff_holdoff); VERBOSE_TOROUT_STRING("torture_onoff end holdoff"); } while (!torture_must_stop()) { |
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if (disable_onoff_at_boot && !rcu_inkernel_boot_has_ended()) { schedule_timeout_interruptible(HZ / 10); continue; } |
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cpu = (torture_random(&rand) >> 4) % (maxcpu + 1); |
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if (!torture_offline(cpu, &n_offline_attempts, &n_offline_successes, &sum_offline, &min_offline, &max_offline)) torture_online(cpu, &n_online_attempts, &n_online_successes, &sum_online, &min_online, &max_online); |
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schedule_timeout_interruptible(onoff_interval); } |
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stop: |
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torture_kthread_stopping("torture_onoff"); |
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return 0; } #endif /* #ifdef CONFIG_HOTPLUG_CPU */ /* * Initiate online-offline handling. */ |
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int torture_onoff_init(long ooholdoff, long oointerval, torture_ofl_func *f) |
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{ |
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#ifdef CONFIG_HOTPLUG_CPU |
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onoff_holdoff = ooholdoff; onoff_interval = oointerval; |
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onoff_f = f; |
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if (onoff_interval <= 0) return 0; |
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return torture_create_kthread(torture_onoff, NULL, onoff_task); #else /* #ifdef CONFIG_HOTPLUG_CPU */ return 0; #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ |
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} EXPORT_SYMBOL_GPL(torture_onoff_init); /* * Clean up after online/offline testing. */ |
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static void torture_onoff_cleanup(void) |
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{ #ifdef CONFIG_HOTPLUG_CPU if (onoff_task == NULL) return; VERBOSE_TOROUT_STRING("Stopping torture_onoff task"); kthread_stop(onoff_task); onoff_task = NULL; #endif /* #ifdef CONFIG_HOTPLUG_CPU */ } |
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/* * Print online/offline testing statistics. */ |
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void torture_onoff_stats(void) |
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{ #ifdef CONFIG_HOTPLUG_CPU |
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pr_cont("onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ", n_online_successes, n_online_attempts, n_offline_successes, n_offline_attempts, min_online, max_online, min_offline, max_offline, sum_online, sum_offline, HZ); |
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#endif /* #ifdef CONFIG_HOTPLUG_CPU */ |
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} EXPORT_SYMBOL_GPL(torture_onoff_stats); /* * Were all the online/offline operations successful? */ bool torture_onoff_failures(void) { #ifdef CONFIG_HOTPLUG_CPU return n_online_successes != n_online_attempts || n_offline_successes != n_offline_attempts; #else /* #ifdef CONFIG_HOTPLUG_CPU */ return false; #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ } EXPORT_SYMBOL_GPL(torture_onoff_failures); |
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#define TORTURE_RANDOM_MULT 39916801 /* prime */ #define TORTURE_RANDOM_ADD 479001701 /* prime */ #define TORTURE_RANDOM_REFRESH 10000 /* * Crude but fast random-number generator. Uses a linear congruential * generator, with occasional help from cpu_clock(). */ unsigned long torture_random(struct torture_random_state *trsp) { if (--trsp->trs_count < 0) { trsp->trs_state += (unsigned long)local_clock(); trsp->trs_count = TORTURE_RANDOM_REFRESH; } trsp->trs_state = trsp->trs_state * TORTURE_RANDOM_MULT + TORTURE_RANDOM_ADD; return swahw32(trsp->trs_state); } EXPORT_SYMBOL_GPL(torture_random); |
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/* |
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* Variables for shuffling. The idea is to ensure that each CPU stays * idle for an extended period to test interactions with dyntick idle, |
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* as well as interactions with any per-CPU variables. |
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*/ struct shuffle_task { struct list_head st_l; struct task_struct *st_t; }; static long shuffle_interval; /* In jiffies. */ static struct task_struct *shuffler_task; static cpumask_var_t shuffle_tmp_mask; static int shuffle_idle_cpu; /* Force all torture tasks off this CPU */ static struct list_head shuffle_task_list = LIST_HEAD_INIT(shuffle_task_list); static DEFINE_MUTEX(shuffle_task_mutex); /* * Register a task to be shuffled. If there is no memory, just splat * and don't bother registering. */ void torture_shuffle_task_register(struct task_struct *tp) { struct shuffle_task *stp; if (WARN_ON_ONCE(tp == NULL)) return; stp = kmalloc(sizeof(*stp), GFP_KERNEL); if (WARN_ON_ONCE(stp == NULL)) return; stp->st_t = tp; mutex_lock(&shuffle_task_mutex); list_add(&stp->st_l, &shuffle_task_list); mutex_unlock(&shuffle_task_mutex); } EXPORT_SYMBOL_GPL(torture_shuffle_task_register); /* * Unregister all tasks, for example, at the end of the torture run. */ static void torture_shuffle_task_unregister_all(void) { struct shuffle_task *stp; struct shuffle_task *p; mutex_lock(&shuffle_task_mutex); list_for_each_entry_safe(stp, p, &shuffle_task_list, st_l) { list_del(&stp->st_l); kfree(stp); } mutex_unlock(&shuffle_task_mutex); } /* Shuffle tasks such that we allow shuffle_idle_cpu to become idle. * A special case is when shuffle_idle_cpu = -1, in which case we allow * the tasks to run on all CPUs. */ static void torture_shuffle_tasks(void) { struct shuffle_task *stp; cpumask_setall(shuffle_tmp_mask); get_online_cpus(); /* No point in shuffling if there is only one online CPU (ex: UP) */ if (num_online_cpus() == 1) { put_online_cpus(); return; } /* Advance to the next CPU. Upon overflow, don't idle any CPUs. */ shuffle_idle_cpu = cpumask_next(shuffle_idle_cpu, shuffle_tmp_mask); if (shuffle_idle_cpu >= nr_cpu_ids) shuffle_idle_cpu = -1; |
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else |
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cpumask_clear_cpu(shuffle_idle_cpu, shuffle_tmp_mask); |
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mutex_lock(&shuffle_task_mutex); list_for_each_entry(stp, &shuffle_task_list, st_l) set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask); mutex_unlock(&shuffle_task_mutex); put_online_cpus(); } /* Shuffle tasks across CPUs, with the intent of allowing each CPU in the * system to become idle at a time and cut off its timer ticks. This is meant * to test the support for such tickless idle CPU in RCU. */ static int torture_shuffle(void *arg) { VERBOSE_TOROUT_STRING("torture_shuffle task started"); do { schedule_timeout_interruptible(shuffle_interval); torture_shuffle_tasks(); torture_shutdown_absorb("torture_shuffle"); } while (!torture_must_stop()); |
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torture_kthread_stopping("torture_shuffle"); |
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return 0; } /* * Start the shuffler, with shuffint in jiffies. */ int torture_shuffle_init(long shuffint) { |
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shuffle_interval = shuffint; shuffle_idle_cpu = -1; if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { VERBOSE_TOROUT_ERRSTRING("Failed to alloc mask"); return -ENOMEM; } /* Create the shuffler thread */ |
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return torture_create_kthread(torture_shuffle, NULL, shuffler_task); |
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} EXPORT_SYMBOL_GPL(torture_shuffle_init); /* * Stop the shuffling. */ |
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static void torture_shuffle_cleanup(void) |
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{ torture_shuffle_task_unregister_all(); if (shuffler_task) { VERBOSE_TOROUT_STRING("Stopping torture_shuffle task"); kthread_stop(shuffler_task); free_cpumask_var(shuffle_tmp_mask); } shuffler_task = NULL; } |
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/* |
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* Variables for auto-shutdown. This allows "lights out" torture runs * to be fully scripted. */ |
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static struct task_struct *shutdown_task; |
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static ktime_t shutdown_time; /* time to system shutdown. */ |
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static void (*torture_shutdown_hook)(void); /* |
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* Absorb kthreads into a kernel function that won't return, so that * they won't ever access module text or data again. */ void torture_shutdown_absorb(const char *title) { |
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while (READ_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { |
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pr_notice("torture thread %s parking due to system shutdown ", title); |
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schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT); } } EXPORT_SYMBOL_GPL(torture_shutdown_absorb); |
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/* |
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* Cause the torture test to shutdown the system after the test has * run for the time specified by the shutdown_secs parameter. */ static int torture_shutdown(void *arg) { |
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ktime_t ktime_snap; |
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VERBOSE_TOROUT_STRING("torture_shutdown task started"); |
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ktime_snap = ktime_get(); while (ktime_before(ktime_snap, shutdown_time) && |
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!torture_must_stop()) { |
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if (verbose) pr_alert("%s" TORTURE_FLAG |
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"torture_shutdown task: %llu ms remaining ", torture_type, ktime_ms_delta(shutdown_time, ktime_snap)); set_current_state(TASK_INTERRUPTIBLE); schedule_hrtimeout(&shutdown_time, HRTIMER_MODE_ABS); ktime_snap = ktime_get(); |
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} if (torture_must_stop()) { |
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torture_kthread_stopping("torture_shutdown"); |
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return 0; } /* OK, shut down the system. */ VERBOSE_TOROUT_STRING("torture_shutdown task shutting down system"); shutdown_task = NULL; /* Avoid self-kill deadlock. */ |
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if (torture_shutdown_hook) torture_shutdown_hook(); else VERBOSE_TOROUT_STRING("No torture_shutdown_hook(), skipping."); |
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if (ftrace_dump_at_shutdown) rcu_ftrace_dump(DUMP_ALL); |
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kernel_power_off(); /* Shut down the system. */ return 0; } /* * Start up the shutdown task. */ int torture_shutdown_init(int ssecs, void (*cleanup)(void)) { |
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torture_shutdown_hook = cleanup; |
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if (ssecs > 0) { shutdown_time = ktime_add(ktime_get(), ktime_set(ssecs, 0)); |
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return torture_create_kthread(torture_shutdown, NULL, |
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shutdown_task); |
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} |
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return 0; |
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} EXPORT_SYMBOL_GPL(torture_shutdown_init); /* |
4622b487e rcutorture: Abstr... |
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* Detect and respond to a system shutdown. */ static int torture_shutdown_notify(struct notifier_block *unused1, unsigned long unused2, void *unused3) { mutex_lock(&fullstop_mutex); |
7d0ae8086 rcu: Convert ACCE... |
564 |
if (READ_ONCE(fullstop) == FULLSTOP_DONTSTOP) { |
fac480efc rcutorture: Add d... |
565 |
VERBOSE_TOROUT_STRING("Unscheduled system shutdown detected"); |
7d0ae8086 rcu: Convert ACCE... |
566 |
WRITE_ONCE(fullstop, FULLSTOP_SHUTDOWN); |
fac480efc rcutorture: Add d... |
567 |
} else { |
4622b487e rcutorture: Abstr... |
568 569 |
pr_warn("Concurrent rmmod and shutdown illegal! "); |
fac480efc rcutorture: Add d... |
570 |
} |
4622b487e rcutorture: Abstr... |
571 572 573 574 575 576 577 578 579 |
mutex_unlock(&fullstop_mutex); return NOTIFY_DONE; } static struct notifier_block torture_shutdown_nb = { .notifier_call = torture_shutdown_notify, }; /* |
bfefc73aa rcutorture: Stop ... |
580 581 582 583 584 585 586 587 588 589 590 591 592 593 |
* Shut down the shutdown task. Say what??? Heh! This can happen if * the torture module gets an rmmod before the shutdown time arrives. ;-) */ static void torture_shutdown_cleanup(void) { unregister_reboot_notifier(&torture_shutdown_nb); if (shutdown_task != NULL) { VERBOSE_TOROUT_STRING("Stopping torture_shutdown task"); kthread_stop(shutdown_task); } shutdown_task = NULL; } /* |
628edaa50 rcutorture: Abstr... |
594 595 596 597 598 599 600 |
* Variables for stuttering, which means to periodically pause and * restart testing in order to catch bugs that appear when load is * suddenly applied to or removed from the system. */ static struct task_struct *stutter_task; static int stutter_pause_test; static int stutter; |
ff3bf92d9 torture: Allow in... |
601 |
static int stutter_gap; |
628edaa50 rcutorture: Abstr... |
602 603 604 605 606 |
/* * Block until the stutter interval ends. This must be called periodically * by all running kthreads that need to be subject to stuttering. */ |
474e59b47 rcutorture: Check... |
607 |
bool stutter_wait(const char *title) |
628edaa50 rcutorture: Abstr... |
608 |
{ |
4ced3314f torture: Make stu... |
609 |
int spt; |
e8516c64f rcutorture: Fix s... |
610 |
bool ret = false; |
4ced3314f torture: Make stu... |
611 |
|
cee439398 rcu: Rename cond_... |
612 |
cond_resched_tasks_rcu_qs(); |
4ced3314f torture: Make stu... |
613 |
spt = READ_ONCE(stutter_pause_test); |
29d393908 torture: Save a l... |
614 |
for (; spt; spt = READ_ONCE(stutter_pause_test)) { |
e8516c64f rcutorture: Fix s... |
615 |
ret = true; |
4ced3314f torture: Make stu... |
616 617 618 619 620 621 |
if (spt == 1) { schedule_timeout_interruptible(1); } else if (spt == 2) { while (READ_ONCE(stutter_pause_test)) cond_resched(); } else { |
628edaa50 rcutorture: Abstr... |
622 |
schedule_timeout_interruptible(round_jiffies_relative(HZ)); |
4ced3314f torture: Make stu... |
623 |
} |
628edaa50 rcutorture: Abstr... |
624 625 |
torture_shutdown_absorb(title); } |
e8516c64f rcutorture: Fix s... |
626 |
return ret; |
628edaa50 rcutorture: Abstr... |
627 628 629 630 631 632 633 634 635 |
} EXPORT_SYMBOL_GPL(stutter_wait); /* * Cause the torture test to "stutter", starting and stopping all * threads periodically. */ static int torture_stutter(void *arg) { |
e8516c64f rcutorture: Fix s... |
636 |
int wtime; |
628edaa50 rcutorture: Abstr... |
637 638 |
VERBOSE_TOROUT_STRING("torture_stutter task started"); do { |
4ced3314f torture: Make stu... |
639 |
if (!torture_must_stop() && stutter > 1) { |
e8516c64f rcutorture: Fix s... |
640 641 642 643 644 645 646 |
wtime = stutter; if (stutter > HZ + 1) { WRITE_ONCE(stutter_pause_test, 1); wtime = stutter - HZ - 1; schedule_timeout_interruptible(wtime); wtime = HZ + 1; } |
4ced3314f torture: Make stu... |
647 |
WRITE_ONCE(stutter_pause_test, 2); |
e8516c64f rcutorture: Fix s... |
648 |
schedule_timeout_interruptible(wtime); |
628edaa50 rcutorture: Abstr... |
649 |
} |
4ced3314f torture: Make stu... |
650 |
WRITE_ONCE(stutter_pause_test, 0); |
628edaa50 rcutorture: Abstr... |
651 |
if (!torture_must_stop()) |
ff3bf92d9 torture: Allow in... |
652 |
schedule_timeout_interruptible(stutter_gap); |
628edaa50 rcutorture: Abstr... |
653 654 |
torture_shutdown_absorb("torture_stutter"); } while (!torture_must_stop()); |
7fafaac5b rcutorture: Fix r... |
655 |
torture_kthread_stopping("torture_stutter"); |
628edaa50 rcutorture: Abstr... |
656 657 658 659 660 661 |
return 0; } /* * Initialize and kick off the torture_stutter kthread. */ |
ff3bf92d9 torture: Allow in... |
662 |
int torture_stutter_init(const int s, const int sgap) |
628edaa50 rcutorture: Abstr... |
663 |
{ |
628edaa50 rcutorture: Abstr... |
664 |
stutter = s; |
ff3bf92d9 torture: Allow in... |
665 |
stutter_gap = sgap; |
2a7d96881 torture: Remove u... |
666 |
return torture_create_kthread(torture_stutter, NULL, stutter_task); |
628edaa50 rcutorture: Abstr... |
667 668 669 670 671 672 |
} EXPORT_SYMBOL_GPL(torture_stutter_init); /* * Cleanup after the torture_stutter kthread. */ |
bfefc73aa rcutorture: Stop ... |
673 |
static void torture_stutter_cleanup(void) |
628edaa50 rcutorture: Abstr... |
674 675 676 677 678 679 680 |
{ if (!stutter_task) return; VERBOSE_TOROUT_STRING("Stopping torture_stutter task"); kthread_stop(stutter_task); stutter_task = NULL; } |
628edaa50 rcutorture: Abstr... |
681 682 |
/* |
b5daa8f3b rcutorture: Abstr... |
683 684 685 686 |
* Initialize torture module. Please note that this is -not- invoked via * the usual module_init() mechanism, but rather by an explicit call from * the client torture module. This call must be paired with a later * torture_init_end(). |
628edaa50 rcutorture: Abstr... |
687 688 689 |
* * The runnable parameter points to a flag that controls whether or not * the test is currently runnable. If there is no such flag, pass in NULL. |
b5daa8f3b rcutorture: Abstr... |
690 |
*/ |
90127d605 torture: Make onl... |
691 |
bool torture_init_begin(char *ttype, int v) |
b5daa8f3b rcutorture: Abstr... |
692 693 |
{ mutex_lock(&fullstop_mutex); |
5228084ee torture: Check fo... |
694 |
if (torture_type != NULL) { |
9eb5188a0 torture: Clarify ... |
695 696 |
pr_alert("torture_init_begin: Refusing %s init: %s running. ", |
5228084ee torture: Check fo... |
697 |
ttype, torture_type); |
9eb5188a0 torture: Clarify ... |
698 699 |
pr_alert("torture_init_begin: One torture test at a time! "); |
5228084ee torture: Check fo... |
700 701 702 |
mutex_unlock(&fullstop_mutex); return false; } |
b5daa8f3b rcutorture: Abstr... |
703 704 |
torture_type = ttype; verbose = v; |
36970bb91 rcutorture: Priva... |
705 |
fullstop = FULLSTOP_DONTSTOP; |
5228084ee torture: Check fo... |
706 |
return true; |
b5daa8f3b rcutorture: Abstr... |
707 708 709 710 711 712 |
} EXPORT_SYMBOL_GPL(torture_init_begin); /* * Tell the torture module that initialization is complete. */ |
2b3f8ffe4 torture: Remove _... |
713 |
void torture_init_end(void) |
b5daa8f3b rcutorture: Abstr... |
714 715 |
{ mutex_unlock(&fullstop_mutex); |
4622b487e rcutorture: Abstr... |
716 |
register_reboot_notifier(&torture_shutdown_nb); |
b5daa8f3b rcutorture: Abstr... |
717 718 |
} EXPORT_SYMBOL_GPL(torture_init_end); |
cc47ae083 rcutorture: Abstr... |
719 720 721 722 723 |
/* * Clean up torture module. Please note that this is -not- invoked via * the usual module_exit() mechanism, but rather by an explicit call from * the client torture module. Returns true if a race with system shutdown |
bfefc73aa rcutorture: Stop ... |
724 725 |
* is detected, otherwise, all kthreads started by functions in this file * will be shut down. |
cc47ae083 rcutorture: Abstr... |
726 727 728 |
* * This must be called before the caller starts shutting down its own * kthreads. |
d36a7a0d5 torture: Address ... |
729 730 731 732 733 |
* * Both torture_cleanup_begin() and torture_cleanup_end() must be paired, * in order to correctly perform the cleanup. They are separated because * threads can still need to reference the torture_type type, thus nullify * only after completing all other relevant calls. |
cc47ae083 rcutorture: Abstr... |
734 |
*/ |
d36a7a0d5 torture: Address ... |
735 |
bool torture_cleanup_begin(void) |
cc47ae083 rcutorture: Abstr... |
736 737 |
{ mutex_lock(&fullstop_mutex); |
7d0ae8086 rcu: Convert ACCE... |
738 |
if (READ_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { |
cc47ae083 rcutorture: Abstr... |
739 740 741 742 743 744 |
pr_warn("Concurrent rmmod and shutdown illegal! "); mutex_unlock(&fullstop_mutex); schedule_timeout_uninterruptible(10); return true; } |
7d0ae8086 rcu: Convert ACCE... |
745 |
WRITE_ONCE(fullstop, FULLSTOP_RMMOD); |
cc47ae083 rcutorture: Abstr... |
746 |
mutex_unlock(&fullstop_mutex); |
bfefc73aa rcutorture: Stop ... |
747 |
torture_shutdown_cleanup(); |
cc47ae083 rcutorture: Abstr... |
748 |
torture_shuffle_cleanup(); |
bfefc73aa rcutorture: Stop ... |
749 |
torture_stutter_cleanup(); |
cc47ae083 rcutorture: Abstr... |
750 |
torture_onoff_cleanup(); |
d36a7a0d5 torture: Address ... |
751 752 753 754 755 756 |
return false; } EXPORT_SYMBOL_GPL(torture_cleanup_begin); void torture_cleanup_end(void) { |
5228084ee torture: Check fo... |
757 758 759 |
mutex_lock(&fullstop_mutex); torture_type = NULL; mutex_unlock(&fullstop_mutex); |
cc47ae083 rcutorture: Abstr... |
760 |
} |
d36a7a0d5 torture: Address ... |
761 |
EXPORT_SYMBOL_GPL(torture_cleanup_end); |
36970bb91 rcutorture: Priva... |
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 |
/* * Is it time for the current torture test to stop? */ bool torture_must_stop(void) { return torture_must_stop_irq() || kthread_should_stop(); } EXPORT_SYMBOL_GPL(torture_must_stop); /* * Is it time for the current torture test to stop? This is the irq-safe * version, hence no check for kthread_should_stop(). */ bool torture_must_stop_irq(void) { |
7d0ae8086 rcu: Convert ACCE... |
778 |
return READ_ONCE(fullstop) != FULLSTOP_DONTSTOP; |
36970bb91 rcutorture: Priva... |
779 780 |
} EXPORT_SYMBOL_GPL(torture_must_stop_irq); |
7fafaac5b rcutorture: Fix r... |
781 782 783 784 785 786 787 788 789 790 |
/* * Each kthread must wait for kthread_should_stop() before returning from * its top-level function, otherwise segfaults ensue. This function * prints a "stopping" message and waits for kthread_should_stop(), and * should be called from all torture kthreads immediately prior to * returning. */ void torture_kthread_stopping(char *title) { |
0d6821d5f torture: Include ... |
791 792 793 794 |
char buf[128]; snprintf(buf, sizeof(buf), "Stopping %s", title); VERBOSE_TOROUT_STRING(buf); |
7fafaac5b rcutorture: Fix r... |
795 796 797 798 799 800 |
while (!kthread_should_stop()) { torture_shutdown_absorb(title); schedule_timeout_uninterruptible(1); } } EXPORT_SYMBOL_GPL(torture_kthread_stopping); |
47cf29b9e rcutorture: Abstr... |
801 802 803 804 805 806 807 808 809 810 811 812 |
/* * Create a generic torture kthread that is immediately runnable. If you * need the kthread to be stopped so that you can do something to it before * it starts, you will need to open-code your own. */ int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m, char *f, struct task_struct **tp) { int ret = 0; VERBOSE_TOROUT_STRING(m); |
6945915e7 torture: Avoid fo... |
813 |
*tp = kthread_run(fn, arg, "%s", s); |
47cf29b9e rcutorture: Abstr... |
814 815 816 817 818 819 820 821 822 |
if (IS_ERR(*tp)) { ret = PTR_ERR(*tp); VERBOSE_TOROUT_ERRSTRING(f); *tp = NULL; } torture_shuffle_task_register(*tp); return ret; } EXPORT_SYMBOL_GPL(_torture_create_kthread); |
9c029b860 rcutorture: Abstr... |
823 824 825 826 827 828 829 830 831 832 833 834 835 |
/* * Stop a generic kthread, emitting a message. */ void _torture_stop_kthread(char *m, struct task_struct **tp) { if (*tp == NULL) return; VERBOSE_TOROUT_STRING(m); kthread_stop(*tp); *tp = NULL; } EXPORT_SYMBOL_GPL(_torture_stop_kthread); |